So, here are some ways to say, “I don’t know,” that will give you time to get the information and provide a professional answer to your uber-demanding boss.

• This is not my area of expertise, but I can find out for you.
• I’m not sure; let me transfer you to someone who can help you.
• I don’t remember off the top of my head. May I check my notes get back to you on that?
• I want to be sure and give you correct information. Let me call you back.
• That’s a good question. I’ll see what I can find out for you.
• I’ve been wondering that, too. Let me ask.
• Amy might be able to answer your question, given that she wrote the report.
• I don’t think I’m the best person to answer that, but I’ll find out who is.
• Based on the information I have, this is what I think.
• Perhaps we should just Google it.